Exit with an error if channel count isn't 1 or 2.

git-svn-id: https://svn.musicpd.org/mpd/trunk@6274 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/pcm_utils.c

@@ -455,6 +455,10 @@ size_t pcm_sizeOfConvBuffer(AudioFormat * inFormat, size_t inSize,
 		case 2:
 			outSize >>= 1;
 			break;
+		default:
+			ERROR("only 1 or 2 channels are supported "
+			      "for conversion!\n");
+			exit(EXIT_FAILURE);
 		}
 	}